Manufacture of warp goods



Sept. 20, 1938. P. SCHONFELD MANUFACTURE" OF WARP GOODS Filed Aug. 16.1937 SMW auz'acw zaz Patented sepezo, 193a UNITED STATES PATENT OFFICE i9 Application August 16,

This invention relates to a method of producing transversely ribbed warpfabric by means of two lapping machines on a warp loom having only onerow of needles, and constitutes an im-' pgggement of'Patent No.2,012,355, of Augustz'i, The purpose of the method covered by thispatent is to produce ribbed warp.goods on a frame having only one row ofneedles by work- 10 ing two sets of threads, one of which forms theusual ground fabric whichis then ribbed by the second thread group. Thewarp fabric produced under the mentioned patent differs from ribbed Igoods made'on machines having two rows of, needies by being transverselyribbed.

' According to the mentioned patent, the lower lapping machine operatingthe second thread group carries out only underlaying operations to formribsby being alternately racked in the same direction as the uppermachine and in the opposite direction thereto. It has been found,however, that goods made in ,this. manner are relatively thin forthereason thatthe threads of the lowerlapping machine -form only looseloops which extend through .the fabric formed by the threads of theupper machine. Such goods are therefore not suited -for all'purposes.

The invention aims at eliminating this drawback by causing the lowermachine to carry out overlaying operations when it'is racked in adirection opposite to theupper machine. In this way the threads of thelower machine will partly help to form loops to fill the goods withoutappreciably interfering with the formation of ribs which, as has beenascertained, are

produced chiefly by the alternate racking of the lower machine once inthe same direction as the upper one and then again in a directionopposite to the latter. ,Only where the two lapping ma- 4 chinesareracked in the same direction is it necessary to retain the underlyingoperations of the lower machine, in which case of course an overlaycould be put in also.

By way of example-the invention is illustrated in the accompanyingdrawing which shows a lapping di am.

As inthe mentioned patent, the threads i are gathered in the uppermachine and the 1937, Serial No. 159,399 JnlyZl, 193'! (or. 66-86) fthreads 2 in the lower machine. The upper machine laps a ground fabricwhich in the example shown has the form of a simple tricot lap; Thelower machine places the thread 2 under three to the left in the firstcourse, in, the second course under three again but to the right and inthe third course under three but to the left again. In the fourth coursethe lower machine operates under two to the right and over one to theleftand in the fifth course under one and over one to the right. In thesixth course the thread 2 of the lower machine is not racked laterally,whereupon the cycle starts again, so that the mode of racking of thelower machine is repeated every six rows.

vOn the left of the diagram the figures i to 6 designate the courses. Itis important that the lower machine in the courses I to l is racked inthe same direction as the upper machine, but opposite to it in course 5.In the fourth and fifth courses the threads 2 form meshes which are 0laid over the needles, which brings about the desired filling of thefabric to such an extent that the threads of the lower machine need notbe drawn in completely for filet work but only partly as for instanceone half. I 25 It is to be remarked that for lapping machines the onewhich is the lower machine is the one to which the needles are appliedwhen the lapping machines are on the side'where the fabric is removedfrom the needles. 1 P

. I claim:

-1. A method of producing transversely ribbed warp fabric by means oftwo lapping machines on a war'p loomhaving only one row of needles,comprising lapping a ground fabric with the 35 upper machine andcarrying out underlayingrop-

